HIDL学习总结--如何在由ICameraProvider.hal文件定义的HIDL接口实现中添加调试Log

其他 2020-09-25 14:37:43 阅读次数: 0

最近调试问题涉及到了ICameraProvider类，该类文件是由ICameraProvider.hal–HIDL接口定义文件经hidl-gen编译工具自动生成的，于是上网学习了下HIDL相关文章1。

为了方便调试，研究实现了在由ICameraProvider.hal接口定义文件自动生成的CameraProviderAll.cpp类中添加一些调试Log的功能。

首先讲解下hidl-gen工具

  • 名称：hidl-gen
  • 工具使用方法：
examples:
croot
hidl-gen -o output -L c++ -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.nfc@1.0::INfc.hal
hidl-gen -o output -L vts -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.nfc@1.0
hidl-gen -o test -L c++ -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.nfc@1.0
hidl-gen -L hash -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.nfc@1.0

  • 源码路径：
    system/tools/hidl

  • 工具入口

//system\tools\hidl\main.cpp

int main(int argc, char **argv) {
    
    
    std::string outputPath;
    std::string rootPath;
    std::vector<std::string> packageRootPaths;
    std::vector<std::string> packageRoots;
    ...
    Coordinator coordinator(packageRootPaths, packageRoots, rootPath);
    coordinator.addDefaultPackagePath("android.hardware", "hardware/interfaces");
    coordinator.addDefaultPackagePath("android.hidl", "system/libhidl/transport");
    coordinator.addDefaultPackagePath("android.frameworks", "frameworks/hardware/interfaces");
    coordinator.addDefaultPackagePath("android.system", "system/hardware/interfaces");

    for (int i = 0; i < argc; ++i) {
    
    
        FQName fqName(argv[i]);
....
       //开始生成
        status_t err =
            outputFormat->generate(fqName, me, &coordinator, outputPath);
...
    }

    return 0;
}

下面讲解ICameraProvider::registerAsService(…)函数声明和函数实现方法的生成过程：

  • 声明函数生成方法：
//system\tools\hidl\generateCpp.cpp
static void declareServiceManagerInteractions(Formatter &out, const std::string &interfaceName) {
    
    
    declareGetService(out, interfaceName, true /* isTry */);//声明tryGetService
    declareGetService(out, interfaceName, false /* isTry */);//声明getService
    //声明registerAsService
    out << "__attribute__ ((warn_unused_result))"
        << "::android::status_t registerAsService(const std::string &serviceName=\"default\");\n";
   //声明registerForNotifications
    out << "static bool registerForNotifications(\n";
    out.indent(2, [&] {
    
    
        out << "const std::string &serviceName,\n"
            << "const ::android::sp<::android::hidl::manager::V1_0::IServiceNotification> "
            << "&notification);\n";
    });

}
  • 生成的函数声明：
//out\soong\.intermediates\hardware\interfaces\camera\provider\2.4\[email protected]_genc++_headers\gen\android\hardware\camera\provider\2.4\ICameraProvider.h
    __attribute__ ((warn_unused_result))::android::status_t registerAsService(const std::string &serviceName="default");
  • 实现函数生成方法：
static void implementServiceManagerInteractions(Formatter &out,
        const FQName &fqName, const std::string &package) {
    
    

    const std::string interfaceName = fqName.getInterfaceName();

    implementGetService(out, fqName, true /* isTry */);//实现tryGetService
    implementGetService(out, fqName, false /* isTry */);//实现getService
    //实现registerAsService
    out << "::android::status_t " << interfaceName << "::registerAsService("
        << "const std::string &serviceName) ";
    out.block([&] {
    
    
        out << "::android::hardware::details::onRegistration(\""
            << fqName.getPackageAndVersion().string() << "\", \""
            << interfaceName
            << "\", serviceName);\n\n";
        out << "const ::android::sp<::android::hidl::manager::V1_0::IServiceManager> sm\n";
        out.indent(2, [&] {
    
    
            out << "= ::android::hardware::defaultServiceManager();\n";
        });
        out.sIf("sm == nullptr", [&] {
    
    
            out << "return ::android::INVALID_OPERATION;\n";
        }).endl();
        out << "::android::hardware::Return<bool> ret = "
            << "sm->add(serviceName.c_str(), this);\n"
            << "return ret.isOk() && ret ? ::android::OK : ::android::UNKNOWN_ERROR;\n";
    }).endl().endl();


    //实现registerForNotifications
    out << "bool " << interfaceName << "::registerForNotifications(\n";
    out.indent(2, [&] {
    
    
        out << "const std::string &serviceName,\n"
            << "const ::android::sp<::android::hidl::manager::V1_0::IServiceNotification> "
            << "&notification) ";
    });
    out.block([&] {
    
    
        out << "const ::android::sp<::android::hidl::manager::V1_0::IServiceManager> sm\n";
        out.indent(2, [&] {
    
    
            out << "= ::android::hardware::defaultServiceManager();\n";
        });
        out.sIf("sm == nullptr", [&] {
    
    
            out << "return false;\n";
        }).endl();
        out << "::android::hardware::Return<bool> success =\n";
        out.indent(2, [&] {
    
    
            out << "sm->registerForNotifications(\"" << package << "::" << interfaceName << "\",\n";
            out.indent(2, [&] {
    
    
                out << "serviceName, notification);\n";
            });
        });
        out << "return success.isOk() && success;\n";
    }).endl().endl();
}
  • 生成的实现方法是：
//out\soong\.intermediates\hardware\interfaces\camera\provider\2.4\[email protected]_genc++\gen\android\hardware\camera\provider\2.4\CameraProviderAll.cpp
::android::status_t ICameraProvider::registerAsService(const std::string &serviceName) {
    
    
    ::android::hardware::details::onRegistration("[email protected]", "ICameraProvider", serviceName);

    const ::android::sp<::android::hidl::manager::V1_0::IServiceManager> sm
            = ::android::hardware::defaultServiceManager();
    if (sm == nullptr) {
    
    
        return ::android::INVALID_OPERATION;
    }
    ::android::hardware::Return<bool> ret = sm->add(serviceName.c_str(), this);
    return ret.isOk() && ret ? ::android::OK : ::android::UNKNOWN_ERROR;
}

至此讲解完成了ICameraProvider::registerAsService(…)的方法的生成过程

下边讲解下如何在ICameraProvider::registerAsService实现函数中添加一些调试log

方法如下：

diff --git a/generateCpp.cpp b/generateCpp.cpp
old mode 100644
new mode 100755
index 158402f..5632958
--- a/generateCpp.cpp
+++ b/generateCpp.cpp
@@ -367,6 +367,9 @@ static void implementServiceManagerInteractions(Formatter &out,
         out.sIf("sm == nullptr", [&] {
    
    
             out << "return ::android::INVALID_OPERATION;\n";
         }).endl();
         //添加注册服务时服务名serviceName的打印
+        out << "ALOGE(\"mytest 11 registerAsService:serviceName %s\", "
+            << "serviceName.c_str());\n";
+
         out << "::android::hardware::Return<bool> ret = "
             << "sm->add(serviceName.c_str(), this);\n"
             << "return ret.isOk() && ret ? ::android::OK : ::android::UNKNOWN_ERROR;\n";
@@ -1091,6 +1094,7 @@ status_t AST::generateCppSources(const std::string &outputPath) const {
    
    
     out << "#include <android/log.h>\n";
     out << "#include <cutils/trace.h>\n";
     out << "#include <hidl/HidlTransportSupport.h>\n\n";
     //添加头文件
+    out << "#include <dlfcn.h>\n";
     if (iface) {
    
    
         // This is a no-op for IServiceManager itself.
         out << "#include <android/hidl/manager/1.0/IServiceManager.h>\n";
@@ -1584,6 +1588,19 @@ status_t AST::generateStubSource(
         << interfaceName
         << "\") { \n";
     out.indent();
     //添加调用堆栈打印
+
+    out << "ALOGE(\"mytest  interfaceName %s\", "<< "_hidl_impl->descriptor);\n";
+    out << "if(!strcmp(_hidl_impl->descriptor,\"[email protected]::ICameraProvider\")){\n";
+    out << "void(*prt_stack_fun)(const char* );\n";
+    out << "void * prt_stack_lib = dlopen(\"/system/lib/libutilscallstack.so\",RTLD_LAZY);\n";
+    out << "prt_stack_fun = (void (*)(const char *))dlsym(prt_stack_lib,\"call_stack_fun\");\n";
+    out << "if(prt_stack_lib!=NULL){\n";
+    out << "prt_stack_fun(\"Create\");\n";
+    out << "}\n";
+    out << "dlclose(prt_stack_lib);\n";
+    out << "}\n";
+
+
     out << "_hidl_mImpl = _hidl_impl;\n";
     out << "auto prio = ::android::hardware::details::gServicePrioMap.get("
         << "_hidl_impl, {SCHED_NORMAL, 0});\n";

编译后的到的结果如下：

//out\soong\.intermediates\hardware\interfaces\camera\provider\2.4\[email protected]_genc++\gen\android\hardware\camera\provider\2.4\CameraProviderAll.cpp
#define LOG_TAG "[email protected]::CameraProvider"

#include <android/log.h>
#include <cutils/trace.h>
#include <hidl/HidlTransportSupport.h>
//添加的头文件
#include <dlfcn.h>
...
::android::status_t ICameraProvider::registerAsService(const std::string &serviceName) {
    
    
    ::android::hardware::details::onRegistration("[email protected]", "ICameraProvider", serviceName);

    const ::android::sp<::android::hidl::manager::V1_0::IServiceManager> sm
            = ::android::hardware::defaultServiceManager();
    if (sm == nullptr) {
    
    
        return ::android::INVALID_OPERATION;
    }
    //添加的log，打印注册服务名
    ALOGE("mytest 11 registerAsService:serviceName %s", serviceName.c_str());
    ::android::hardware::Return<bool> ret = sm->add(serviceName.c_str(), this);
    return ret.isOk() && ret ? ::android::OK : ::android::UNKNOWN_ERROR;
}

BnHwCameraProvider::BnHwCameraProvider(const ::android::sp<ICameraProvider> &_hidl_impl)
        : ::android::hidl::base::V1_0::BnHwBase(_hidl_impl, "[email protected]", "ICameraProvider") {
    
     
           //添加的log，打印接口名
            ALOGE("mytest  interfaceName %s", _hidl_impl->descriptor);
            //添加的堆栈打印
            if(!strcmp(_hidl_impl->descriptor,"[email protected]::ICameraProvider")){
    
    
            void(*prt_stack_fun)(const char* );
            void * prt_stack_lib = dlopen("/system/lib/libutilscallstack.so",RTLD_LAZY);
            prt_stack_fun = (void (*)(const char *))dlsym(prt_stack_lib,"call_stack_fun");
            if(prt_stack_lib!=NULL){
    
    
            prt_stack_fun("Create");
            }
            dlclose(prt_stack_lib);
            }
            _hidl_mImpl = _hidl_impl;
            auto prio = ::android::hardware::details::gServicePrioMap.get(_hidl_impl, {
    
    SCHED_NORMAL, 0});
            mSchedPolicy = prio.sched_policy;
            mSchedPriority = prio.prio;
}

重新编译CameraProvider，将得到的[email protected] push到system/lib下
得到的输出log如下：

02-16 01:43:45.225   613   613 E android.hardware.camera.provider@2.4::CameraProvider: mytest 11 registerAsService:serviceName legacy/0
02-16 01:43:45.225   613   613 E android.hardware.camera.provider@2.4::CameraProvider: mytest  interfaceName android.hardware.camera.provider@2.4::ICameraProvider
02-16 01:43:45.248   613   613 D SGJ_Create: #00 pc 00009e0f  /system/lib/libutilscallstack.so (call_stack_fun+42)
02-16 01:43:45.248   613   613 D SGJ_Create: #01 pc 000152cb  /system/lib/android.hardware.camera.provider@2.4.so (android::hardware::camera::provider::V2_4::BnHwCameraProvider::BnHwCameraProvider(android::sp<android::hardware::camera::provider::V2_4::ICameraProvider> const&)+278)
02-16 01:43:45.248   613   613 D SGJ_Create: #02 pc 000194fb  /system/lib/android.hardware.camera.provider@2.4.so
02-16 01:43:45.248   613   613 D SGJ_Create: #03 pc 000377d3  /system/lib/vndk-sp/libhidltransport.so (std::__1::function<android::sp<android::hidl::base::V1_0::IBase> (void*)>::operator()(void*) const+26)
02-16 01:43:45.248   613   613 D SGJ_Create: #04 pc 00031d6b  /system/lib/vndk-sp/libhidltransport.so (_ZN7android8hardware8toBinderINS_4hidl7manager4V1_015IServiceManagerEEENS_2spINS0_7IBinderEEENS6_IT_EE+218)
02-16 01:43:45.248   613   613 D SGJ_Create: #05 pc 00031b03  /system/lib/vndk-sp/libhidltransport.so (android::hidl::manager::V1_0::BpHwServiceManager::_hidl_add(android::hardware::IInterface*, android::hardware::details::HidlInstrumentor*, android::hardware::hidl_string const&, android::sp<android::hidl::base::V1_0::IBase> const&)+174)
02-16 01:43:45.248   613   613 D SGJ_Create: #06 pc 0003c7e9  /system/lib/vndk-sp/libhidltransport.so (android::hidl::manager::V1_1::BpHwServiceManager::add(android::hardware::hidl_string const&, android::sp<android::hidl::base::V1_0::IBase> const&)+18)
02-16 01:43:45.248   613   613 D SGJ_Create: #07 pc 00016fb3  /system/lib/android.hardware.camera.provider@2.4.so (android::hardware::camera::provider::V2_4::ICameraProvider::registerAsService(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char>> const&)+222)
02-16 01:43:45.248   613   613 D SGJ_Create: #08 pc 00000ee5  /vendor/bin/hw/android.hardware.camera.provider@2.4-service
02-16 01:43:45.248   613   613 D SGJ_Create: #09 pc 00000e5d  /vendor/bin/hw/android.hardware.camera.provider@2.4-service
02-16 01:43:45.248   613   613 D SGJ_Create: #10 pc 00000de7  /vendor/bin/hw/android.hardware.camera.provider@2.4-service
02-16 01:43:45.248   613   613 D SGJ_Create: #11 pc 00080b45  /system/lib/libc.so (__libc_init+48)
02-16 01:43:45.248   613   613 D SGJ_Create: #12 pc 00000ca4  /vendor/bin/hw/android.hardware.camera.provider@2.4-service

至此，研究实现了在由ICameraProvider.hal接口定义文件自动生成的CameraProviderAll.cpp类中添加一些调试Log的功能。

  1. 查阅的资料连接地址https://blog.csdn.net/yangwen123/article/details/79840569 ↩︎

猜你喜欢

转载自blog.csdn.net/u010116586/article/details/92813278
今日推荐
开源日报 | Chrome内置Gemini的意义不在于Gemini；中国AI追随之路的五大误区；ECharts创始人“下海”养鱼；谷歌I/O开发者大会什么都有，只是没有惊喜
微软回应中国区AI团队“打包赴美”传闻
基于大语言模型的开源知识库问答系统 MaxKB GitHub Star 数量突破 5,000 个！
美国拟限制 AI 大模型出口中国和俄罗斯
苹果将与 OpenAI 达成协议，将 ChatGPT 应用于 iPhone
openKylin 社区生态委员会第六次会议圆满召开
阿里云正式发布通义千问 2.5
Python 3.13 发布首个 Beta：实验性自由线程模式和 JIT、改进交互式解释器
Stack Overflow 拿我的代码去训练 AI 大模型，还封了我的账号
Pop!_OS 的 COSMIC 桌面完成 App Store 上架工作
《2024 年一季度互联网投融资运行情况》研究报告
报告：Django 仍然是 74% 开发者的首选
周排行
返回指定时间格式
fopen函数中的mode参数
Java 单例模式探讨
Flex remoteobject工作原理探讨
寻找mplayer的便捷安装方法
30天了解30种技术系列---(26)MySQL自动化运维工具Inception
关于Jboss/Tomcat/Jetty的JNDI定义123
程序减肥，strip，eu-strip 及其符号表
AsyncTask、View.post(Runnable)、ViewTreeObserver三种方式总结frame animation自动启动
Json和Bean的互相转换
每日归档
更多
2024-05-15(24)
2024-05-14(0)
2024-05-13(18)
2024-05-12(0)
2024-05-11(38)
2024-05-10(38)
2024-05-09(35)
2024-05-08(42)
2024-05-07(14)
2024-05-06(40)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022